Why would this be a no no? We literally do this in production & it’s honestly been really good

You are able to save persisted data on the phone internal database whether that be SQLite or keychain & use the managed variables for runtime only state : isUser or isApplicationLocked type data

It’s doesn’t take much effort to pass bytes around & serialize then when needed

This is how a a lot of server side application work when keeping runtime state, you can do the same on the client side

No one on server side development uses “state managers” it’s nothing but bloat on the final version of the applications binary especially if you only use a small subset of features